Threading-machine.



H. E. GROSS. THREADING MACHINE. APPLICATION FILED APB.18, 1910.

Patented De0.20,1910.

2 BEBETS-SHEET 1 INVENT W x P UE WITNESSES. Vk' fl 2 W. 75%

fi 5 Qu THE NORRIS PETERS co., WASHINGTON. n. c,

2 SHEETS-SHEET 2.

Patented De0.20, 1910..

H. E. GROSS. THREADING MACHINE.

APPLIOATION FILED APR. 18. 1910.

IIFIIIIHIIIIIIHIIIIII WITNESSES. 5. WK

HE AORRIS PETERS cu., WASHINGTON n c UNITED STATES PATENT QFFICE.

HARRY E. GROSS, OF KNOXVILLE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF 'lOWALTER H. AREAS, OF PITTSBUR-G, PENNSYLVANIA.

THREADING-MTACHINE.

Specification of Letters Patent.

Patented Dec. 20, 1910.

Application filed April 18, 1910. Serial No. 556,236.

To all whom it may concern:

Be it known that I, HARRY E. Guess, a resident of Knoxville, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Threadiri -Machines; and I do hereby declare thefollowing to be a full, clear, and exact description thereof.

My invention relates to threading machines for cutting threads on apipe, tube or other article which is round in cross-section.

The object of my invention is to provide a form of apparatus by means ofwhich both ends of the pipe may be threaded without changing theposition of the pipe in the holding chuck, thereby doing away with theextra handling of the pipe and reducing the time required for threading,and at the same time providing a machine in which the manual laborrequired in the handling of the pipe is reduced to a minimum and theoutput greatly increased.

To these ends my invention comprises, generally stated, a plurality ofrotary-chucks arranged side by side, and a transversely movablethreading die at opposite ends of said chucks, and means for moving saidthreading dies into position for operation in connection with the pipesheld within said chucks, whereby said dies operate simultaneously, theone on the end of one pipe and the other on the opposite end of theother pipe, all as fully hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a plan view of my improvedthreading apparatus; Fig. 2 is an enlarged side elevation partly brokenaway; and Fig. 3 is a section on the line 3-3 Fig. 2.

Referring to the drawings, the numeral 2 designates a suitable base orfoundation of brick work or concrete, as may be desirable. and mountedon the raised portion of said bed are the housings 3. These housingsform bearings for the rotary-barrels 4, 4. These barrels are providedwith the gears 5 and said barrels are driven in pairs by means of themotors (3. The motor-shaft has the pinion 7 which meshes with thegear-wheel 8 on the shaft 9, and the pinion 10 on said shaft 9 mesheswith one of the gear-wheels 5. While I have illustrated my invention inone of the preferred forms where there are two sets of barrels geared inpairs as indicated, I do not wish to limit myself in any way to thisparticular arrangement, as any number of barrels may be employed and maybe driven independently.

The barrels are provided with the chucks 11 which may be of any suitableconstruction for clamping or holding the pipe se curely within thebarrels.

Extending transversely of the barrels is the track or guideway 12 whichsupports the carriages 13, 13 The carriages are provided with thechannels it which engage the guides 12, and in order to prevent thetilting or upward movement of the carriages in operation, guard-flangesl5 engage the upper faces of the channels 14:. The carriages 13 carrythe die-holders 16 which support suitable dies of a common constructionand it has not been deemed necessary to illustrate or describe the samein detail. The dieholders 16 are arranged to be moved along thecarriages 13, 13 and said die-holders engage the guides 17 on saidcarriages. The die-holders are further provided with the rack-bars 18,With the teeth 19 formed therein, and pinions 19 on the shafts 20 areadapted to engage the teeth of said rack bars 18. The shaft 20 isjournaled in the carriage 13 and secured to the outer end of said shaftis the hand-wheel 21 by means of which the die-holder is moved back andforth on the carriage 13' to bring it into position to engage the end ofthe pipe to be threaded, as fully hereinafter set forth.

The carriages 13, 13 are movable on the guides 12 and to provide forthis movement I employ the rack-bar 22 with which the gear 23 is adaptedto engage. The gear 23 is mounted on the shaft 21. The shaft 25 of themotor 25 has the worm 25 which engages the worm 25 on the shaft 2%.

The skids 26 are supported on the uprights 26, and arranged to deliverthe pipe to the machine and to transfer the same therefrom after thethreading operation.

In threading pipe with my improved apparatus, the pipe before beingthreaded is arranged as at 27 and 28 at opposite sides of the machine,and the carriages carrying the dies are moved over on the tracks 12 to aposition clear of the first pair of barrels 4. Two pipes are then rolledfrom the pile 27 down the skids 26 so as to bring the said pipes intoposition with reference to the barrels 4: when the pipes are inserted insaid barrels and clamped securely therein by the chucks ll. Thecarriages 13, 13 carrying the dies are then moved over intoalinementwith the pipes, the carriage 13 in line with the end of onepipe and the carriage 13 in line with the end of the opposite end of theother pipe, when the operators turning the hand-wheels 21 move the diesup into position to engage the ends of the pipes as indicated in fulllines Fig. 1. The power is then applied to rotate the barrels 4c, andthe pipes carried thereby, whereupon the threading of the pipes isaccomplished, the die-holders being moved in their guides toward thebarrels until the right amount of thread has been formed on the pipe. Itwill be apparent from the construction illustrated that the direction ofthe rotation of the barrels I when geared up as described to rotate inopposite directions will form a right-hand thread on the pipes, asindicated in Fig. 1. When the threading of one end of each of the pipeshas been accomplished, the rotation of the barrels l is stopped, and theoperators, by means of the hand-wheels 21 withdraw the die-holders,whereupon the power is applied to move the carriages 13, 3 over into theposition indicated in dotted lines Fig. 1, and the dies are then movedinto position to engage the pipes, and the pipes are threaded at theother ends. 'hen the pipes have been threaded at both ends, thecarriages 1?). 13 are drawn to one side and the pipes drawn out of theright-hand end of the barrels l, whereupon they roll down the skids tothe piles 30 and 3 In the meantime pipes are. fed from the pilesandsecured in the barrels l and the threading of these pipes is done in thesame manner as above set forth. The di rection of the rotation of thebarrels is reversed so as to give a right hand thread to the pipes. Byarranging the barrels in pairs in this manner, a single threading deviceat each end does all of the threading. and while the pipes are beingremoved from one pair of blanks. the 'threading is being done in theother pairs.

It will be apparent from the above, the operation of threading the pipesis greatly facilitated by not having to remove the pipes from thebarrels until both ends have been threaded, which is made possible bymoving the die-holders transversely of the barrels, as illustrated, sothat one end of each pipe is being threadedat the same time. By such anarrangement also a right hand thread is being formed on each pipe, eachpair of barrels being geared up and driven by the same source of power.

By my improved machine, I am enabled to greatly reduce the amountofsteps required by having machines arranged in such a position that noreversal of the pipe is required for the threading operation, and at thesame time I reduce the amount of manual labor required in handling thepipe, so that the capacity of the machine is greatly increased.

It is apparent that there may be many different arrangements andmodifications of my invention without in any way alliecting the broadprinciple, and I do not Wish to limit myself in any way to theparticular form of apparatus illustrated and described.

hat. I claim as my invention is:

1. In threading-machines, the combination of a plurality ofrotary-holders, means for rotating same, and a transversely movablethreading device at one end of each of said holders.

2. In threading-machines, the combination of a plurality of rotaryholders, means for rotating said holders in opposite directions, and atransversely movable threading device at one end of each of saidholders.

3. In threadingmachines, the combination of a plurality ofrotary-holders, means for rotating same, transversel movable carriagesat one end of each of said holders, and movable threading devicescarried thereby.

l. In threading-machines, the combination of a plurality ofrotary-holders, gears on said holders meshing with each other, means fordriving one of said holders, and a transversely movable threading deviceat one end of each of said holders.

In testimony whereof, I, the said HARRY 1 E. Gnoss have hereunto set myhand.

HARRY E. GROSS. \Vitnesses IIALLOCK C. SI'IERRARD, Rom. D. TOTTEN.

